Use a bubble sort algorithm to rearrange the following numbers into ascending order, showing the new arrangement after each pass.
$$\begin{array} { l l l l l l l l }
19 & 3 & 7 & 20 & 2 & 6 & 5 & 15
\end{array}$$
Write down the number of comparisons and the number of swaps during the first pass.
(2 marks)